Valve device with a valve housing having multiple shift tongues

Abstract

A valve device which comprises a valve housing having a plurality of shifting tongues and a valve slide that can move longitudinally in the valve housing. The valve slide is made with diameter sections which co-operate with the shifting tongues depending on an axial position of the valve slide. At least one of the diameter sections is made with at least one, at least approximately groove-like recess that extends in the circumferential direction of the valve slide. The groove-like recesses are functionally connected to an axial bore extending in the valve slide essentially in the axial direction, by way of at least one radial bore extending at least approximately in the radial direction in the valve slide.

Description

[0001]This application claims priority from German patent application serial no. 10 2011 084 932.7 filed Oct. 21, 2011.FIELD OF THE INVENTION[0002]The invention concerns a valve device with a valve housing having a plurality of shifting tongues.BACKGROUND OF THE INVENTION[0003]In valve devices known from practice, which are made with a valve housing having a plurality of shifting tongues and a valve slide arranged to move longitudinally in the valve housing, depending on the geometry of the valve housing and the valve slide a pressure field is formed around the valve slide which is not symmetrical. Among other things the pressure field depends on the geometric shape of the valve slide, for example whether it is conical, straight or designed cylindrically. Furthermore, the pressure field also depends on bevels formed in the area of the valve housing bore. An unsymmetrical pressure field is formed, in particular, when shifting tongues of the valve housing are produced by a casting pro...

AI Technical Summary

Benefits of technology

The present invention is a valve device with a housing and a slide that can be easily operated with small controls. The design prevents leaks and allows for smooth movement in the valve. This invention aims to provide a simple yet effective valve solution.

Problems solved by technology

An unsymmetrical pressure field is formed, in particular, when shifting tongues of the valve housing are produced by a casting process since in that case they are not rotationally symmetrical to the required extent.

In the area of the valve slide unsymmetrical pressure fields result in radial and axial forces that act upon the valve slide and impair the functionality of the valve device.

In such pressure systems, leaks between the high-pressure area carrying the system pressure and the working pressure area are disadvantageous when the working area is connected by means of the valve slide to the low-pressure area and the pressure in the working pressure area has to be reduced to the pressure level of the tank, since the leakage and thus also the venting time of a volume-affected consumption depend markedly on temperature and on the system pressure.

In general leaking always takes place in the area of a valve device when for example the gap size between the valve housing and the valve slide is large or the viscosity of the medium carried in the area of the valve device is very low.

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